I'm sorry for nitpicking a bit, but...when Delta had to kill Sinclair in Bioshock 2, Sinclair said he'd rather die a man than continue living as a monster. So when he was revived here he didn't seem to mind at all coming back as a Big Daddy. it's minor, but it bugged the hell out of me how it wasn't even briefly touched upon.

Also there's the whole bonding thing with Eleanor, if he's too far away from her, he'll go in a coma or become mentally unstable. Yet Delta seems totally fine.

And then there's the whole killing Sophia Lamb thing, it's disturbingly out of character if you're going with the good version.

However this is your first Fan Fiction. I can't say anything on your writing style, but maybe you should work on doing proper research and writing/analysing characters?

First of all, that I am SO THANKFUL that you made a fiction wherein Delta and Sinclair work together, as their partnership in the game was actually engaging. I'm so happy that you took it and made it evolve.

Second, that the way you write, technically, is fantastic. Not too long, not too short, just enough to have my attention while not letting me miss any details when I skim over some parts.

Third, that you put characterization and description so well together, and WOW. You really put thought into the settings!

Last, that you updated! I saw this a few days ago, and assumed that it was left stagnant; I am so happy you updated. Please keep up the good work. This story is amazing.